Guam County, Guam
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The National Weather Service's Watches, Warnings and Advisories by state counties include: Thunderstorm, Tornado, Flood, Flash Flood, Winter Storm, High Wind, Gale, Small Aircraft, High Surf, Marine, Heat, Air Quality, Ashfall, Hazardous, and Special Statements.
Weather Alerts: Guam County, Guam
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High Surf Advisory
GUZ001>004-182100-
/O.CAN.PGUM.SU.Y.0002.000000T0000Z-171022T2000Z/
/O.NEW.PGUM.SU.Y.0003.171018T0700Z-171024T0800Z/
GUAM-ROTA-TINIAN-SAIPAN-
408 PM CHST WED OCT 18 2017

...HIGH SURF ADVISORY IN EFFECT UNTIL 6 PM CHST TUESDAY...

THE NATIONAL WEATHER SERVICE IN TIYAN HAS ISSUED A HIGH SURF
ADVISORY, WHICH IS IN EFFECT UNTIL 6 PM CHST TUESDAY.

FOR SOUTH FACING REEFS...
HAZARDOUS SURF OF 7 TO 9 FT THIS EVENING WILL RISE TO BETWEEN 8
AND 11 FT EARLY THURSDAY MORNING. SURF WILL GRADUALLY SUBSIDE
ALONG SOUTH FACING REEFS LATE IN THE WEEK AS THE SOUTHWEST SWELL
BECOMES A WEST SWELL.

FOR WEST FACING REEFS...
HAZARDOUS SURF OF 7 TO 9 FT AT TINIAN AND SAIPAN AND SURF OF 6 TO
8 FT AT ROTA AND GUAM WILL BUILD TONIGHT TO BETWEEN 8 AND 11 FT BY
THURSDAY MORNING. AS SOUTHWEST TO WEST SWELL INCREASES THURSDAY...
SURF WILL BUILD TO BETWEEN 10 AND 13 FT. SURF MAY INCREASE FURTHER
OVER THE WEEKEND...POSSIBLY BECOME DANGEROUS AT 15 FT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HIGH SURF WILL WILL PRODUCE LOCALIZED BEACH EROSION AND DANGEROUS
SWIMMING CONDITIONS. AVOID VENTURING OUT ON EXPOSED REEFS AND
BEACHES...ESPECIALLY THOSE FACING SOUTH AND WEST...AS RIP CURRENTS
WILL BE LIFE THREATENING.

A HIGH SURF ADVISORY MEANS THAT HIGH SURF WILL AFFECT BEACHES IN
THE ADVISORY AREA...PRODUCING LOCALIZED BEACH EROSION AND DANGEROUS
SWIMMING CONDITIONS.

&&

$$

Special Weather Statement
GUZ001>004-181100-
Guam-Rota-Tinian-Saipan-
1045 AM ChST Wed Oct 18 2017

TROPICAL STORM LAN (25W) IS LOCATED NEAR 12N133E...ABOUT 835 MILES
WEST OF GUAM. IT WILL SLOWLY MOVE ALONG A GENERAL NORTHWARD
HEADING...PASSING WELL WEST OF THE MARIANAS OVER THE NEXT FEW DAYS.
ANOTHER WEAK CIRCULATION...ABOUT 85 MILES WEST-NORTHWEST OF SAIPAN
NEAR 16N145E IS EXPECTED TO DEVELOP WITHIN THE MONSOON TROUGH OVER
THE MARIANAS AS IT MOVES EASTWARD THROUGH TONIGHT. THIS CIRCULATION
AND MONSOON WILL MAINTAIN GUSTY SHOWERS AND ISOLATED THUNDERSTORMS
THROUGH AT LEAST THURSDAY NIGHT. IMPROVING WEATHER IS EXPECTED LATER
IN THE WEEK.

SEAS WILL STEADILY INCREASE IN RESPONSE TO BUILDING SOUTHWEST SWELL
GENERATED FROM THE BROAD CIRCULATION OF TROPICAL STORM LAN. SEAS
COULD REACH AS HIGH AS 11 TO 13 FEET OVER THE WEEKEND. THESE LARGE
SWELL WILL MAINTAIN HAZARDOUS SURF AND A HIGH RISK OF RIP CURRENTS
INTO EARLY NEXT WEEK.

CONDITIONS WILL NEED TO BE MONITORED CAREFULLY AS SEAS AND SURF
BUILD...ESPECIALLY FOR MARINE ACTIVITIES LATER THIS WEEK AND OVER THE
WEEKEND. THE CIRCULATION NEAR SAIPAN WILL ALSO NEED TO BE WATCHED
CLOSELY AS IT GRADUALLY DEVELOPS BEFORE HEADING NORTH AND AWAY FROM
THE AREA THIS WEEKEND.

IF YOU ARE PLANNING OUTDOOR OR MARINE ACTIVITY OR INTER-ISLAND TRAVEL
BE AWARE OF CURRENT MARINE CONDITIONS AND STAY INFORMED ON THE LATEST
FORECASTS AND ADVISORIES ISSUED BY THE NATIONAL WEATHER SERVICE AND
LOCAL EMERGENCY MANAGEMENT OFFICES.

PRODUCTS ISSUED BY THE NATIONAL WEATHER SERVICE ARE POSTED ON THE WFO
GUAM WEB PAGE AT WWW.PRH.NOAA.GOV/GUAM/.

$$

National Weather Service

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